Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-48
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Non-isolated sensors
The non-isolated sensors are connected with the local ground potential (local
ground). When using non-isolated sensors, you must connect M
ANA
to the local
ground.
Connecting non-isolated sensors
Caused by local conditions or interferences, potential differences U
CM
(static or
dynamic) can occur between the locally distributed individual measuring points. If
the potential difference U
CM
exceeds the permissible value, you must provide
equipotential bonding conductors between the measuring points.
When connecting non-isolated sensors to optically isolated modules, you can
operate the CPU in Grounded mode (refer to the figure below) or Ungrounded
mode.
Non-isolat
ed sensors
M+
M
L+
M–
M
ANA
M+
M–
Backplane bus
U
CM
ADC
M
interna
l
L+
M
Ground bus
CPU
U
ISO
Equipotential
bonding
conductor
Logic
Figure 4-9 Connecting Non-Isolated Sensors to an Isolated AI

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)